Device fob cutting pipe



April 10, 1928. 1,665,707

- J. LEVY DEVICE FOR CUTTING PIPE Filed July 16. 1924 s Sh ets-Sheet 1 J. LEVY DEVICE FOR CUTTING PIPE Filed July 16. 1924 3 Sheets-Shut 2 LIV-It J. LEVY DEVICE FOR CUTTING PIPE Filed J ul.v 16. 1924 s Sheets-Sheet 3 u rill ll LII l llnl lll J ltl ll .l ll.

Patented Apr. 10, 1928.

moon LEVY, or BOSTON, Massaonusnrrs.

1 Lac-e707 OFFICE. i

DEVICE FOR CUTTING PIPE.

Application filed July 16,

This invention relates to the art of cutting or tllreading pipes, such as stein pipes,.water pipes etc., for proper assemblage in a pipe system, and is intended to provide a simple and compact construction in which suitable cutting tools, including both thread cutting and severing tools with their proper accessories, are operatively associated together in a frame work which forms a compact motor casing so that the device is readily portable to the actual situs of the job being done. I r

To this end the invention comprises, generally speaking, a casing for operatively supporting a driving motor and a revoluble hollow pipe-receiving shaft combined with a revoluble head detachably secured to said shaft and carrying cutting toolsso mounted as to perform their proper cutting operations upon the pipe, with means rendered operative at will to automatically shift the cutting tools relative to the center in accordance with the requirements of the work. This andother features of the invention will be. particularly described in the following specificationand will be defined in the claims hereto annexed.

In the accompanying drawings I have illustrated a simple and convenient construction and. arrangement embodying the various features of this invention, inwhich Figure 1 is a longitudinal vertical section through the, hollow revolublc shaft supported in the upper partof the casing'and carrying the detachable head in which the cutting tools are operativelymoun'ted.

Figure a front end. elevation of the IQVOlUlQlC head.

.l igure 8 is a detail view in front elevation of one of the slide blocks or tool carriers mounted in said head.

Figure at is a'detail View of one of the removable handles ofthe head.

Figure 5 aside elevation of the com plete casing and assembled head.

. Figure 6 is a rear elevation of the toolcarrying head.

Figure 7 is a front elevation of the comple'te casing and hollow shaft in assembled relation, the tool-carrying head being-removed from theshaft. i i

Figures 8 and. 9 are detail views slimving the luuid-controlled stop mcmbers'by which the feeds of the cutting toolsare governed.

Figure 10 is a horizontal section through the upward extension of the casing carrying 1924. Serial No. 726,274.

the hand-shiftable stop members shown in- Figure 9. I

- Figure ll'is ail-enlarged longitudinal cross sectional view of a threaded pipe showing the form of cut made by the threading dies.

As'the present device is particularly intended for portable use, I provide a hollow casing 1, whose front and rear ends, at their top, are formed-with semicircular bearings for the reception of a revoluble shaft 5, the other half of said bearings being formed in the cover or top 2 which is detachably bolted to the main body orcasing 1. Thelower part of the casing forms a motorchamber for receiving a small motor :0 whose shaft projects into a lateral gear chamber 3. and

whose open side is closed by aremovably secured. plate 3 so as to form a grease chamher to allow the transmission gears to run in oil. The through which the pipev to be machined is inserted preferably mounted in annular bushing or bearing rings 5" which areinterposed between the semi-circular bearing openings in the casing body 1 and those-in the cover or top 2, as shown in Figure 1..

At its forward end the tubular shaft is provided with uninterrupted outwardly projecting flange 5 which forms attaching wings by which therevoluble head is detachably secured by suitableholts or screws-to said shaft. I 3 3 Around the middle portion of the hollow shaft 5 is secured a bevelled tooth gear ring 5 which inter-meshes with adrivingpiniOn 5 which the last element of the gear, train transmission leading from the motor 0.,t0 the revoluble shaft 5. ,Without goinginto exact details as'to the. transmission train, it will suflice to, state that it will be of the re revoluble hollow shaft 5 ducing type so that thespeed of the motor w shall be geared down, to an appropriate speed for. thewcutting head. Insidefthe hol low shaft I preferablyprovide a 7 support or guide for, the inserted pipe to be operated on and this comprises, as shown, a skeleton tube 20 secured byxahset screw inside the hollow shaft 5 and "provided with removable bushingsQl at each end, whic'lrhushings may he of any suitable internal diameter to fit different sizes of pipes to be cut.

i The cutting operations which this machine is intended to perform are; first, thecutting of a thread on the pipe bymeans of suitable tln'ead-cutting'dies; and second, the severing or cuttingolf of the pipe at any desired ameters of pipe within the capacity or range distance'from the end thereof. I will first describe the construction by which the thread cutting is effected preparatory to cutting off the length of pipe.

As before explained, to the flanged front end of the revoluble hollow shaft is detachably bolted a tool-carrying head 6. As shown in Figures 1 and 2, the front face of this head isprovided with parallel ribs or flanges 6 whichform tracks for two opposed slide blocks 7, each of which carries two threading dies in the form shown. T hose threading dies 8 are mounted in approximately radial slide ways or grooves '7, as shown in Figure 8, formed in each block T with the cutting teeth of the die projectinginwardly beyond the line of the circular aperture which is substantially concentric with the axisof the revoluble shaft. To make ample provision for setting the threading dies to different distances from the center to operate satisfactorily upon different diameters of pipe, each elongated die 8 provided with a series of spaced holes 8, and the face plate of the block 7 covering these slide ways or grooves are provided with another series of holes 7 spaced on a different gage from the gagewhich characterizes the spacing ofthe holes 8 so that, on the vernier system,diiferent holes in the adjustable die may be brought into registry with appropriate holes in the face plate of the-carrier block 7 to secure the proper adjustments suitable for cutting the various standard diof the machine. When the proper hole 8' of each die is brought into registry with the proper hole 7? to give the appropriate radial distance for the particular pipe to be cut, thumb screws 8 are inserted through the outer hole into the registering hole in the die so that the die is thereby locked in its position of adjustment.

Were the dies to be kept in such position of adjustment so as to cut the entire thread to its full dept-h it would plow up an outstanding burr of metal at the point where thethread cuttingceases and this would re quired finishing off with a file by hand. In order to avoid this'objectionable result Z makeprovision for gradually withdrawing the dies automatically as they approach the h end of the thread to be cut. j The means for preventingthe formation 'of this burr at the end of the thread comprisesdie-shifting meanswhich are rendered operative at will by the throwing in by hand of a stop member arranged in the path of the adjusting device so that, as the head revolves, the die-adjusting means, by engagement with said stop member, are operated during the last one, two or three revolutions of the 'headto shift the dies relative to the axis of rotation so as to gradually withdraw them toward the surface of the pipe, thereby producing toward the end of the cutting oper-- ation a decrease in the depth, as shown in Figure 11. This is accomplished by means of feed screws 9 which pass through and have threaded engagement with projecting bosses 6" on the face of the revoluble head and on opposite sides of the center thereof. The inner ends of these feed screws abut against the carrier blocks 7, and these two carrier blocks have their inner or opposed faces provided with recesses 7" in which are seated helical compression springs 7, preferably coiled around guide pins 7, which normally tend to force said carrier blocks apart. The inner ends of the feed screws 9 abut against the outstanding faces of the two blocks, thereby normally maintaining the two carrier blocks in close engagement. with each other. On the outer ends of said screws are secured pinions 9 which intermesh with adjacent pinions 10 which are compounded with star wheels or turn-stiles 10 whose arms, when engaged'with the upper end of the stop member 80, are intermittently ro-' tated and therefore cause the reverse rotation of the feed scew 9 each time that the feed screw, in its orbit, passes by the stop member 80. In consequence of this intermittent turning of the feed screws, the can rier blocks are allowed to expand apart, thereby moving the dies to a greater dis tance from the central axis and causing the progressive shallowing of the thread, thereby preventing the raising or plowing up of an objectionable burr of metal.

For convenience in the hand setting of the thread-cutting dies to accommodate (litterent diameters of pipe, I provide a laterally projecting pin 8 (Fig. 3) which, wheuthe die is in its outermost position, is located in a recess in the face plate. This projects far enough, as shown in Figure 1, to easily ma 'nipulate the die members in order to set them. at different distancesfrom the center.

The pipe-cutting members that are used for severing or cutting off the pipe are best shown in Figures 1 and 6. Each cutting cle ment comprises a sharp cutting disk or wheel 16, rotatably mounted in a radial slide 15 which is held in different positions of adjustment by means of a feed screw 17 provided with a thrust collar or shoulder 17", and hav ing at its outer end a turn-stile or star wheel 18.

The rcvolublc head is provided with three such radial ways for receiving three such severing cutters, and I provide means similar to that already described in connection with the thread-cutting tools, for progressively feeding the severing cutters inward to cut ill) ' with the turn-stiles for shifting the lll thread-cutting dies, has a similar'manipulat ing, projecting pin 8O and has similar notches or recesses 80 adapted to be engaged by a spring pressed detent 80. The shifting stop 80 for the die-cutting member is made longer so as to be drawn outwardly beyond the orbital path of the turnstiles 10, while the forward stop member 16 is made shorter and is moved inwardly to be set out of the path of its turn-stiles 18.

In practice, therefore, as the threads cutters approach the .end of their travel, after having cut the necessary length of thread along the pipe, the operator, by merely pushing in the stop member 80, insures the gradual retraction of the thread-cutting dies away from the center to prevent burr. At about the same time or immediately following such setting of the stop member 80, the operator may raise the stop member 16 in the path of the turn-stiles 18 so t-hatthe cutting off tools begin to advance toward the pipe. By the time the thread is finished the pipe cutters are advanced in. contact with the pipe and begin the cutting operation. Vith each revolution of the head, each severing cutter moves one step im ardly and this operation continues until the pipe is com pletely severed.

In order to keep the work exposed to the cutting tools Wet with oil, I provide a closed oil. reservoir 11 mounted on the top or pe riphery of the revoluble head, as shown in Figures 1 and 2, the filling orifice of which is tightly closed by a plug 11. A drip pipe or oil-delivering pipe 11" is carried down to within a short distance of the pipe, being cut, and the drip or flow of oil is controlled by the regulating valve 11.

As the device is a com nu'atively small portable one for carrying around to the work, it is desirable to provide means for preventing the thrust of the motor-driven revolving head from reacting to cause the reverse rotation of the casing itself when the pipe being cut is held in a vise which will usually be the case. I provide the casing or frame at any suitable point, say in the side wall, as shown in Figure 5, with a socket 40 in which may be inserted a threaded handle 41 adapted to be grasped by the hand to hold the casing stationary against reverse revolution in relation to the pipe anchored in the vise. Asshown in dotted lines in Figure 7, such a socket willbe provided on opposite sides of the casing. The handle need not necessarily beheld by the operatorsince. if it is" allowed to rest against the bench or a block on the bench, 1t -W1ll act asa resisting lever to prevent rotation of the casing. i a

For emergency use in; case of accident to the motor I have provided sockets 42 on opposite sides of the ,revoluble head to re ceive the threaded handles 11 so that the head may be turned by hand in case of need. 1

To facilitate the removal 'of-one or both of the bosses 6", in'which the stopscrews 9v are threaded in order to remove the carriage blocks, 7, one or both may be made with a rearwardly extending shank 6 passing through an. orificein the'rotary head and clamped inplace by means of a clamping nut 6 'onthe back of the revoluble head, .as shown in Figure (3.

A feature of considerable practical importance is the employment of a definitely located stop shoulder on each stop screw 9 so that,by merely turning in the stop screw until the stop shoulder 9 abuts against the boss 6", the thread cutting dies are easily and simultaneously adjusted to the correct inmost position concentric with the center of revolution. This construction dispenses with the necessity of having the operator exercise great care and skill in setting each one of the thread cutters to its proper gaging position to cut the required depth of thread. The accurate and easy setting or gaging of the thread-cutting dies effects a very material economy of time and requires no skill for its accomplishment. 7

What I claim is:

1. A device for cutting pipe, embracing in its construction a supporting frame, a

revoluble hollow shaft mounted"therein and v provided with interiorly disposed removable pipe-supporting and centering means, a toolcarrying head secured to said shaft, a pair,

of opposed slide blocks mounted on said head, thread-cutting dies adjustably secured thread out toward the end of the cutting operation in order tofavoid formation of a projecting burr at the end of the thread, substantially as described.

2. A device for cutting threads on pipe, embracing in its construction a supporting frame, a revoluble hollow shaft provided with means for centrally supporting the pipe to be threaded, a revoluble head thereon, oppositely movable tool-carrying members mounted on said head and normally forced apart by spring action, stop screws forl imit-,

the stop screws to be intermittently turned to allow the tool-carrying members to move apart to prevent formation of a projecting burr at the end portion of the thread being cut, substantially as described. v

3. A device for cutting pipe embracing in its construction a revoluble head, a plurality of thread cutting die members arranged radially in said head with their cutting edges projecting toward the cent-rally disposed pipe to be cut, adjustable supporting blocks for said dies, said die members being provided with a plurality of spaced holes,

the blocks also being provided with a plurality of differently spaced holes arranged in line with the holes in the die members, and adjusting pins insertable through any of the holes in the blocks into selected holes of the die members to provide a step by stepv adjustinentforpositioning the dies in relation to the Work, substantially as described.

4. A device for cutting pipe embracing in its construction revoluble tool-carrying head, a series of thread cutting die nembers radially arranged to present their cutting edges toward a centrally disposed pipe, adjustable supporting blocks for said dies said die members and said blocks being provided with pin-receiving holes arranged in the same radial planes, the holes in the dies'and in the blocks being diilerentially spaced to permit a complete range oi adjustment, and a holding pin adapted to be inserted through a hole in the block into an appropriate hole in the die when they are brought into registry to set the die at a predetermined distance from the center, substantially as describeds a In witness whereof, I have subscribed the above specification.

JACOB LEVY 

